SYSTEM FOR POWERING A WELL INSTRUMENT Russian patent published in 2007 - IPC G05F1/00 

FIELD: geophysics, examination of deep drilled wells.

SUBSTANCE: system for powering a well instrument contains constant current power supply, electric logging cable, having two conductors, each one of which on one side is electrically connected to corresponding input clamp of well tool, and on other side - to corresponding output clamp of constant current supply, and voltage regulation device with program control. Regulation device includes voltage set-point generator, output of which is connected to input of constant current supply, computer, output of which is connected to one input of voltage set-point generator, control block having controlling input and two outputs, one of which is connected to control input of voltage set-point generator, and other one - to control input of computer, two transformers of analog signal to digital form, output of each one of which is connected to corresponding inputs of voltage set-point generator and computer, voltage meter, clamps of which are connected practically to output clamps of power supply, and output - to input of one analog signal transformer, current meter, clamps of which are coupled between one output clamp of power supply and corresponding conductor of cable, and output - to input of another analog signal transformer.

EFFECT: stabilization of voltage at output of cable of any nomenclature with simultaneously increased reliability of operation of well instrument.

2 cl, 2 dwg